IOS8之后增加了UIAlertController类,它可以表示UIAlertView和UIActionSheet.它继承自UIViewController。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {self.window.backgroundColor=[UIColor whiteColor];[self.window makeKeyAndVisible];ViewController *vc=[[ViewController alloc]init];UINavigationController *nvc=[[UINavigationController alloc]initWithRootViewController:vc];self.window.rootViewController=nvc;return YES;
}

//
//  ViewController.m
//  AlertVC
//
//  Created by City--Online on 15/5/25.
//  Copyright (c) 2015年 XQB. All rights reserved.
//#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom];btn.frame=CGRectMake(100, 100, 50, 50);[btn setTitle:@"按钮" forState:UIControlStateNormal];[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];btn.layer.borderWidth=2.0;[btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:btn];}
-(void)btnClick:(id)sender
{
//    UIAlertController *alert=[UIAlertController alertControllerWithTitle:@"Title" message:@"message" preferredStyle:UIAlertControllerStyleAlert];
//
//    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
//        textField.text=@"name";
//        textField.clearsOnBeginEditing=YES;
//    }];
//    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
//        textField.text=@"password";
//        textField.clearsOnBeginEditing=YES;
//    }];UIAlertController *alert=[UIAlertController alertControllerWithTitle:@"Title" message:@"message" preferredStyle:UIAlertControllerStyleActionSheet];UIAlertAction *actionOk=[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {NSLog(@"确定");}];UIAlertAction *actionCancel=[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {NSLog(@"取消");}];[alert addAction:actionOk];[alert addAction:actionCancel];[self presentViewController:alert animated:YES completion:nil];
}
- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}@end